From: noah AT cloud9 DOT net (Noah Levenson)
Newsgroups: comp.os.msdos.djgpp
Subject: pixel scanning in Allegro?
Date: Thu, 23 Jan 1997 03:36:00 GMT
Organization: Cloud 9 Internet, White Plains, NY, USA
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Message-ID: <5c6bse$qeo@news.cloud9.net>
Reply-To: noah AT cloud9 DOT net
NNTP-Posting-Host: noah.dialup.cloud9.net
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

I'm using Allegro with DJGPP and I want to "scan" a certain number of
pixels from a 2d pcx file.  The first thing I thought of was to use
the getpixel function, but this doesn't work.  All I need to do is get
the color (number in the pallete, I guess) of a pixel at x,y on the 2d
image.  I _thought_ that by assigning the output of the getpixel
function to an integer variable, I could do this.  I wrote a simple
progarm to load a pcx and set the pallete, (that part works, I've
tested it) and assign the integer from getpixel to a variable
"pixeldata".  The program then used printf to write the integer to the
screen.  When I compile, I get a warning that says "passing arg 1 of
'printf' makes pointer of integer without a cast".  It DOES output
something, but it is a short string of nonesense ascii characters.
What is going on?  An email response would be preferable.  Thanks so
much.

Noah Levenson
noah AT cloud9 DOT net